Add DecodedImageCallback::Decoded() function with custom decode time value.

webrtc/modules/video_coding/main/source/timing.cc

Index: webrtc/modules/video_coding/main/source/timing.cc
diff --git a/webrtc/modules/video_coding/main/source/timing.cc b/webrtc/modules/video_coding/main/source/timing.cc
index 8d59135876017c38845367474c758426bd14f242..d8ab96d84466ddc1a674a139f62ad806782b5726 100644
--- a/webrtc/modules/video_coding/main/source/timing.cc
+++ b/webrtc/modules/video_coding/main/source/timing.cc
@@ -165,13 +165,13 @@ void VCMTiming::UpdateCurrentDelay(int64_t render_time_ms,
 }
 
 int32_t VCMTiming::StopDecodeTimer(uint32_t time_stamp,
-                                   int64_t start_time_ms,
+                                   int32_t decode_time_ms,
                                    int64_t now_ms,
                                    int64_t render_time_ms) {
   CriticalSectionScoped cs(crit_sect_);
-  int32_t time_diff_ms = codec_timer_.StopTimer(start_time_ms, now_ms);
-  assert(time_diff_ms >= 0);
-  last_decode_ms_ = time_diff_ms;
+  codec_timer_.MaxFilter(decode_time_ms, now_ms);
+  assert(decode_time_ms >= 0);
+  last_decode_ms_ = decode_time_ms;
 
   // Update stats.
   ++num_decoded_frames_;